Level Sensors

Level sensors determine how full or how empty a container is. Level sensors provide an output electrical signal at predetermined levels to communicate when to open or close control valves.


Level Sensor Types


The choice of sensors is usually determined by which substance is being measured, the environment in which the sensor is to used and in which position the sensor needs to be mounted. Some of the most common level sensors are:


Capacitive level switches


  • Capacitive level switches provide a basic full/empty level indication determined by the mounting position of the sensor. This type of switch is non-contact and uses a sensing field to determine liquid levels. Capacitive sensors provide accurate switching even with heavy residue build-up.

Vibrating level probes


  • Vibrating level probes use a rod or a fork that constantly produce high-frequency vibrations. When the vibrating probe comes into contact with the medium, the vibration changes and the vibrating level switch outputs a switching command. Vibrating level switches are used as overfill protection devices or low-level indicators in liquids as well as in granular and powder bulk solids.

Conductive level switches


  • Conductive level switches are sensors that use stainless steel probes with an electrical contact output to measure a specific liquid level. Used in conjunction with a level control relay to set and monitor each probe. Applications include ponds, reservoirs, sumps, pharmaceuticals, closed vessels and open tanks.

Ultrasonic level sensors


  • Ultrasonic level sensors generate ultrasonic sound pulses that are reflected by the surface of a liquid medium. The time travelled by the ultrasonic pulse is calculated by the sensor which then determines the distance of the liquid to give an accurate fill level. The ultrasonic sensor’s response is influenced by turbulence, pressure, moisture, and temperature.

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Omschrijving Prijs Device Type Mounting Type Switch Output Body Material Cable Length Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating Hazardous Area Certification
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Guided Wave Liquid Level Transmitter Vertical 3 Wire, 4 to 20 mA Aluminium (Enclosure), Stainless Steel 316L (Rod) 5.5m -40°C +150°C - 30V 20 mA 17bar - 50 mA -
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RS-stocknr. 189-2705
FabrikantnummerLBFH-21.010.A03020.1.4003.0
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€ 212,90
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Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel - -40°C +85°C - 30V 100 mA 10bar - 100 mA ATEX
RS-stocknr. 182-5618
FabrikantnummerPS64.ACTTCAHXKMXXX
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€ 3.649,00
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RS-stocknr. 188-5255
FabrikantnummerCD34CNFLFPOT5
FabrikantCarlo Gavazzi
€ 80,94
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Conductive Plug PNP Plastic 300mm -25°C +80°C - 30V 13 mA - - 100 mA -
RS-stocknr. 539-5735
FabrikantnummerCP64.XXFGARKMX L=300
FabrikantVega
€ 1.149,06
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Capacitance Horizontal, Vertical Relay PTFE - -50°C +200°C - - 1 A dc, 3 A ac 64bar - - -
RS-stocknr. 804-4159
Fabrikantnummer7ML1106-1BA200A
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Ultrasonic - - - - -20°C +65°C - - - - - - -
RS-stocknr. 780-0298
FabrikantnummerSM20
FabrikantCynergy3
€ 75,79
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- - - - - 0°C +50°C - - - - - - -
RS-stocknr. 177-9137
Fabrikantnummer9038CG36
€ 428,51
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Mechanical Alternator Screw In - Painted Cold-Rolled Steel - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - - -
RS-stocknr. 804-3963
Fabrikantnummer7ML5746-1BA00-1AA0
FabrikantSiemens
€ 550,00
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Vibrating Level Switch Vertical Relay Stainless Steel - -50°C +250°C - - 400 mA 64bar - - -
RS-stocknr. 183-7324
FabrikantnummerGRF18S-N234LV
FabrikantSick
€ 95,47
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Level Sensor Threaded - Stainless Steel - -25°C +55°C - 30V - 16bar - 30 mA -
RS-stocknr. 177-9139
Fabrikantnummer9038CG32
€ 428,51
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Mechanical Alternator Screw In - Painted Cold-Rolled Steel - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - - -
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FabrikantGems Sensors
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Level Switch Vertical SPST NO Polysulfone 1.8m -40°C +48.9°C 240V - - 50psi - - -
RS-stocknr. 889-1185
FabrikantnummerLU23-00
FabrikantFlowline
€ 666,93
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Ultrasonic Level Transmitter Vertical - Polycarbonate 3m -35°C +60°C - 24V 20 mA 30psi Viton - -
RS-stocknr. 493-6830
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FabrikantVega
€ 246,23
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Radar - - PBT - - - - - 20 mA 4bar - - -
RS-stocknr. 124-0112
FabrikantnummerDL24-01
FabrikantFlowline
€ 511,49
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Ultrasonic Level Transmitter Vertical - PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM 1 A -
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